Decay is the only cost.
I am level 15.84 Paramedic. Help me level up.
I use a FAP-90, Tier 1 and a Herb Box, Tier 1. Both are equipped with Economy Enhancers, free of charge.
FAP-90 (as per Entropedia and my skill level):
17.85 Heal/Sec
5.95 Heal/PEC
Herb Box (Maxed):
6.56 Heal/Sec
10.56...